Speed Control Motor/Brushless Motor Speed - Torque Characteristics of Brushless Motors

The figure below shows an example of the characteristics of a brushless motor. As shown in the example in the figure below, brushless motors have an almost constant rated torque from low to high speeds. The motors can be used without any loss of torque at low speeds, as is the case with AC speed control motors.

Speed - Torque Characteristics

• Limited Duty Region
  This is the area of combined rotation speed and torque that can be used, providing it is for short periods of time. It is used to improve responsiveness during acceleration and deceleration.
• Continuous Duty Region
  This is an area of combined speed and torque that can be used in continuous operation.